A permanent-wave treatment method which can give a permanent-wave comfortably without using a cap or a turban, and a treatment auxiliary agent used in this method. The permanent-wave treatment method comprises a winding step of applying permanent-wave treatment liquid to hair and winding the hair around rollers, and a liquid drop prevention step of sprinkling a powdery treatment auxiliary agent on the wound hair so as to prevent the permanent-wave treatment liquid from dropping. The treatment auxiliary agent comprises powder which adsorbs or partially dissolves in permanent-wave treatment liquid, and serves to increase the viscosity of the powder-sprinkled permanent-wave treatment liquid and prevent the permanent-wave treatment liquid from dropping.